JPH0654576B2 - Standby release circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to an improvement of a waiting period cancellation circuit of a video tape recorder.

(B) Conventional technology The VHS video tape recorder is in the tape unloading state in the stop mode. When setting the play mode or the record mode, the cylinder is driven to perform the tape loading, and then the reel and the capstan are switched. Since it has to be driven to press the pinch roller and apply tension, it takes several seconds from the play mode setting operation to start playback, and it is a major issue to shorten the time required for mode setting. there were.

Therefore, on pages 44 to 49 of the September 1987 issue of "TV Technology" published by Electronic Technology Publishing Co., Ltd., the stop mode is set in a state in which tape loading is performed in conjunction with cassette loading. , The time required to set the play mode has been shortened to about 3.2 seconds, and the tape can be fast-forwarded and rewound in the tape loading state to enable quick cueing.

(C) Problems to be Solved by the Invention However, the VHS video tape recorder employs a system in which the upper cylinder is rotated, and it takes a considerable amount of time for the rotary head to reach a predetermined rotational speed. This makes it difficult to set other modes quickly in the conventional configuration.

Therefore, in the stop mode, it is necessary to drive the cylinder motor without applying tape tension to enable quick mode setting.

However, if the cylinder is continuously driven in the stop state, power will be wasted.

(D) Means for Solving the Problem Therefore, the present invention is characterized in that the driving of the cylinder motor is stopped or the tape is unloaded to turn off the power after a certain period of time has passed since the stop mode was set.

(E) Action According to the present invention, the cylinder motor driven during the stop mode setting is stopped after a predetermined time.

(F) Examples Hereinafter, the present invention will be described with reference to two illustrated examples.

First, in the first embodiment, the drive of the cylinder motor is stopped when the mode changing operation is not performed for 5 minutes or more after the stop mode setting is detected. However, in the first embodiment,
Needless to say, the start of the 5-minute timer may be linked to the start of the operation of the tape loading mechanism, and the timer period is not limited to 5 minutes.

First, states A to B in FIG. 1 are schematic plan views of the VTR mechanism in each mode of the present embodiment. State A is a cassette unload state, state B is a cassette load state, and state C is a state. Indicates a tape load state, and state D indicates a constant speed running state.

Therefore, in this embodiment, when the cassette (CA) is inserted into the cassette holder (CH) in the state A, the cassette loading is performed and the state becomes the state B. In the state B, the cassette (CA) is set on the supply reel stand (SM) and the take-up reel stand (TM).
Supply reel (SR) and take-up reel (TR) are fitted to each other, and a pair of tape guides (TG) (TG) and tension pins (T) are provided in the notches in front of the cassette (CA).
P) and Capstan (CP) are invaded. As soon as this state B is reached, the (upper) cylinder (CY) is rotated, the tape guide (TG) (TG) moves, the tape is pulled out from the cassette (CA), and the tape is loaded into the rotating cylinder (CY). Let it wind and fall into state C. In this state C, the cylinder (CY) is rotated to enter the 5-minute waiting mode (stop mode). When fast forward or rewind operation is performed in this state C, the capstan motor is rotated and the take-up reel (TR) or the supply reel (SR) is driven at high speed.
When a play operation or a record operation is performed from the state C, the capstan (CP) is rotated and the pinch roller (PR) is brought into pressure contact with the capstan (CP) and the tension pin (TP) is brought into contact with the tape. To be These modes are completed by returning to the state C after applying the brake to the reel base by the stop operation. When the stop mode (state C) is set, the cylinder (CY) maintains the rotating state, but the rotation is stopped after 5 minutes, and the state C is maintained. When the stop operation is further performed in the stop mode, the state B is returned to the power off state. Further, in any of the states B, C, and D, the state A falls into the state when the eject operation is performed.

FIG. 2 shows a rotation block diagram connected to the microcomputer computer (1) for syscon. (2) shows that the cassette (CA) is inserted into the cassette holder (CH) in the state A. A cassette-in sensor that mechanically detects and outputs a detection output, (4) is a stop button that also functions as a power button, (5) is for mode setting such as fast forward button, rewind button, play button, record button, etc. Mode setting button group, (6) is an eject button for eject operation that responds in any state, (7) is a reservation button group
The reservation information is set and stored by the operation of (8), the reservation output is issued when the reservation information is set, the warning output is issued ten seconds before the reservation time, the reservation start output is issued when the reservation starts, and the reservation end when the reservation ends. The timer microcomputer (10) that outputs the reservation end output is operated by the syscomputer microcomputer (1) and in the power-on state by the display means (9) and the tuning button group (21). This is a power supply circuit for driving the tuner (11) and energizing the power supply so that other circuits can be driven. However, in the present embodiment, the timer microcomputer (7), the system microcomputer (1), and some display means (not shown) are driven by another power supply circuit (not shown) that is normally driven. I shall. Also, (15) is the loading motor drive circuit.
Driven by (12) and connected to mode setting mechanism (20), cassette loading mechanism (18) and tape loading mechanism (1
Loading motor that can be selectively connected to (9), (1
(6) is a cylinder motor driven by a cylinder drive circuit (13) including a cylinder servo to rotate the upper cylinder, and (17) is a capstan motor drive circuit (14) including a capstan servo that drives the capstan ( C
P) is driven and the supply reel base (S
The capstan motor that selectively drives M) and the take-up reel stand (TM), (3) detects the movement of the mode setting mechanism and mechanically detects each state of A to D Each of the mode detecting means for emitting a detection output is shown.

The feature of this embodiment is that a 5-minute timer (1a) and a cylinder drive control means (1c) are formed, as is apparent from the functional block shown in the block of the microcomputer computer (1) for syscon. In point. The five-minute timer (1a) is configured to count a waiting time of five minutes in the stop mode and issue a time-up output, and the cylinder control means (1c) is used for the tape unloading during the tape loading period. During the daytime period and each mode setting period, operation of the mode button group (5) and mode detection means
Cylinder motor drive circuit based on the output of (3) (13)
The cylinder motor drive circuit (13) is driven for 5 minutes from when the stop mode is set to when the time-up output is issued.

The operation of this embodiment will be described below with reference to the flow chart of FIG.

First, in this embodiment, the cassette (CA) is set in the state of FIG. 1A.
The cassette-in sensor (2) detects that the is inserted into the cassette holder (CH), the system microcomputer for computer (1) turns on the power supply circuit (10) and drives the loading motor drive circuit (12). Excuse me. In the state A, the loading motor (15) driven by the loading motor drive circuit (12) is in an interlocking relationship with the cassette loading mechanism (18) and the mode setting mechanism (20), and the cassette (CA) Inserted cassette holder (C
H) performs cassette loading (see FIG. 1B). Upon completion of cassette loading, the loading motor (15) is disengaged from the cassette loading mechanism (18) and is switched so as to interlock with the tape loading mechanism (19). At the same time, when the mode detecting means (3) detects the completion of cassette loading in association with the movement of the mode setting mechanism (18), the microcomputer (MC) drives the cylinder motor drive circuit (13) to drive the cylinder motor (16). To rotate the upper cylinder. Tape loading mechanism (1
In 9), the tape is pulled out by the tape guide (TG) (TG) in the cassette and the tape is loaded on the cylinder (CY) in the rotating state. The tape loading mode setting mechanism (20) applies a brake to the take-up reel base (TM) so that the tape is fed from the supply reel (SR). Completion of tape loading is a mode detection means
(3) detected by loading motor drive circuit (1
2) stops driving and the rotation of the loading motor (15) is stopped. At the same time, in this state (see FIG. 1C), the mode setting mechanism (20) releases the brake for the take-up reel stand, A soft brake is applied to the reel stand (SM) (TM) to set the stop mode.

In this step mode, the microcomputer can check whether the stop button (4) has been operated, whether the 5-minute timer (1a) has timed out or not, and the timer microcomputer.
Presence / absence of notice output in (7), mode button group excluding stop button (5)
The first question cycle in which the presence or absence of the operation of and the presence or absence of the operation of the eject button (6) are cyclically checked.

(A) First, when the eject button (6) is operated, the capstan motor drive circuit (14), the loading motor drive circuit (12) and the cylinder motor drive circuit (13) are driven, and the loading motor (15) ) Reverse rotation causes the tape loading mechanism (19) to move in the unloading direction, and the supply reel stand (S
M) is rotated and the excess tape is wound around the supply reel (SR). During this unloading, the cylinder motor (16) is always kept in a driving state. When the mode detecting means (3) detects the completion of the tape unloading, the cylinder motor drive circuit (13) and the capstan motor drive circuit (14) are stopped. With the completion of tape unloading, the loading motor (15)
On the other hand, the tape loading mechanism (19) is removed, the cassette loading mechanism (18) is connected, and cassette loading is performed. When the mode detection means (3) detects the end of this cassette unloading, the loading motor drive circuit (15) stops driving, and then the power supply circuit (10) stops driving with the operation of the stop button (4). Then the power is turned off.

(b) When the mode button group (5) is operated in the stop mode, the loading motor drive circuit (12) is driven in conjunction with the corresponding mode button, the mode setting mechanism (20) is driven, and the predetermined When the mode detecting means (5) detects the mode setting state (1), the driving of the loading motor drive circuit (12) is stopped, the desired circuit is brought into the driving state, and the predetermined mode is executed.

However, the stop mode, the fast-forward mode, and the rewind mode are all common to the state C of FIG. 1, and when the fast-forward button or the rewind button is operated in the stop mode, the mode setting mechanism does not operate, and as a related circuit. Only the capstan motor drive circuit (14) is driven, and the winding or supply reel base is driven at high speed according to the rotation direction of the capstan motor (17).
Further, when the record button or the play button is operated in the stop mode, the mode setting mechanism (20) causes the capstan (C
After the pinch roller (PR) is crimped to (P) and the tension pin (TP) is brought into contact with the tape, driving of the loading motor drive circuit (15) is stopped and the capstan motor drive circuit ( 14) and recording circuit (22)
Alternatively, the reproducing circuit (23) is driven.

When another mode button is operated in such a setting mode, the loading motor drive circuit (12) is driven and both reel stands (T
After the brake is applied to M) (SM), the mechanism is set to the corresponding mode state, and the mode detection means (3) detects the completion of the mode setting and activates the loading motor drive circuit (12). Stop it. At the same time, the related circuit corresponding to the mode button is driven to enter the desired setting mode.

When the stop button (4) is operated in the desired mode, the driving of the capstan drive circuit (14) is stopped, the loading motor drive circuit (12) is driven, and both reel stands are braked. After this is added, the stop mode is set, and the mode detecting means (3) detects the setting of the stop mode, whereby the driving of the loading motor drive circuit (12) is stopped and the 5-minute timer (1a)
Is started and the process returns to the first question cycle described above.

Further, when the eject button (6) is operated in the desired mode, the brake is applied to both reel stands (TM) (SM), and then the loading motor drive circuit as described above.
(12), the cylinder motor drive circuit (13) and the capstan motor drive circuit (14) are driven, the tape loading mechanism (18) retracts the tape guide (TG) (TG), and the mode setting mechanism ( 20) Take-up reel stand (TM)
With the brake applied, the surplus tape is wound on the supply reel (SR) and the tape is unloaded. After the tape unloading is completed, the cassette unloading described above is performed.

(C) In the first question cycle, a 5-minute timer (1
When the time-up information is generated from a), the cylinder motor drive circuit (13) is stopped. After stopping the cylinder, whether or not the stop button (4) is operated, the eject button
The presence / absence of the operation (6), the presence / absence of the operation of the mode button group (5), and the presence / absence of reservation information are cyclically checked, and the second question cycle is entered.

When the stop button (4) is operated or the timer reservation output is obtained from the timer microcomputer (7) in the second inquiry cycle, the power off mode described later is entered. When the eject button (6) is operated, the eject operation described above is performed. Furthermore, the mode button group excluding the record button
When (5) is operated, the cylinder motor drive (13) is driven, and the state is the same as when the mode button group (5) is operated in the first inquiry cycle. However, when the mode button is the fast forward button or the rewind button, the capstan drive circuit (14) is driven after a waiting time of 2 seconds.

(D) When the operation of the stop button (4) is detected in the first question cycle or the second question cycle, or when the timer reserved output is obtained in the second question cycle, the cylinder motor At the same time as the drive circuit (13) and the capstan motor drive circuit (14) are driven, the loading motor drive circuit (12) is driven and the tape loading mechanism (19) and mode setting mechanism (20) are driven. To be done. As a result, the tape is separated from the rotating cylinder (CY) with the movement of the tape guide (TG), and a brake is applied to the take-up reel stand (TM) by the mode setting mechanism (20). The surplus tape is wound on the supply reel (SR) by the supply reel base (SM) which is interlocked with the capstan motor (16). When this tape unloading is detected by the mode detection means (3), the power supply circuit (10), cylinder motor drive circuit (13), capstan motor drive circuit (14), and loading motor drive circuit (12) are all non- Fall into a driving state. A third question that detects the presence / absence of operation of the mode buttons other than the stop button (4), eject button (6), and record button in the power-off state and the presence / absence of reserved output of the timer microcomputer (7) Fall into a cycle.

When the stop button (4) is operated in the third interrogation cycle, the power supply circuit (10) becomes in a drive state, and the cylinder motor drive circuit (13) and the loading motor drive circuit (12) It is driven, the tape loading is started, the 5-minute timer (1a) is started, and the first interrogation cycle is entered. When the eject button (6) is operated in the third interrogation cycle, the power supply circuit (10) and the loading motor drive circuit (12) are driven and the eject mode is detected by the mode detection means (3). When it is detected, the power is automatically turned off and the operation ends.

Further, when the mode buttons other than the record button are operated in the third question cycle, the power supply circuit (10) is first driven to be in the power-on state, and the loading motor drive circuit (12) and the cylinder motor drive circuit (13). Is driven and tape loading is performed. When the tape loading is completed, the mode setting described above is performed.

Further, when a warning output is further generated from the timer microcomputer (7), the power supply circuit (10) is driven and the power is turned on, and the loading motor drive circuit (12) and the cylinder motor drive circuit (13) are driven. , Tape loading is done. Wait for generation of reservation start output of the timer microcomputer (7) in stop mode when loading is completed. The loading motor drive circuit (12) that generates the reservation start output is driven, the mode setting mechanism (20) is driven, the tension pin (TP) is brought into contact with the tape, and the pinch roller (PR) is passed through the tape. It can be pressed onto a pinch roller (PR). When this record mode setting is detected, the capstan motor drive circuit (14) and the recording circuit
(22) and are in the drive state and the record mode is set. After that, the record mode is maintained until the reservation end output is generated from the timer microcomputer (7), and when the reservation end output is generated, the capstan motor drive circuit (1
4) Stop driving and load the motor drive circuit (1
By driving 2), a brake is applied to both reel stands (SM) (TM) by the mode setting mechanism (20) to set the stop mode, and the tape unloading described above is continuously performed to turn off the power. Set and fall into the third question cycle.

In the above-described first embodiment, after only 5 minutes, only the rotation of the cylinder is stopped and the power supply circuit is driven to activate the tuner and guarantee the monitoring state of the channel selected on the VTR side. If it is not necessary, perform tape unloading and turn off the power circuit.
If the power is turned off, it is possible to prevent waste of power consumption. Therefore, a second embodiment in which the power is turned off after 5 minutes will be described below.

FIG. 4 shows a circuit block diagram of this embodiment, and FIG.
The same components as those in the embodiment are designated by the same reference numerals and the description thereof will be omitted. The features of the circuit connection in FIG. 4 are:
There is a point that the operation outputs of the reservation button group (8) and the tuning button group (21) are input to the system microcomputer for computer (1), and a 5 minute timer (in the block of the system computer for computer (1) shown in the figure ( 1a) and a power supply control means (1b) are arranged.

First, the 5-minute timer (1a) counts the waiting time of 5 minutes from the start of the stop mode setting, and restarts (resets) this counting in synchronization with the tuning operation, and in the power-off state, it interlocks with the tuning operation. And count the waiting period of 5 minutes,
It is a means for generating time-up output. Further, the power supply control means, when the stop operation is performed again in the stop state, when the timer microcomputer issues the reservation output accompanying the completion of the reservation, when the time up output is issued, the tape unloading is performed. This is a means to bring the power off state. Further, the power supply control means (1b) is in a power-on state when the mode button group (5) other than the record button or the stop button (4) is operated in a power-off state, thereby performing tape loading, When a tuning operation or reservation operation is performed in the power off state,
The power-on state is set, and the power-off state is set by the reserved output or the time-up output.

The operation of this embodiment, which is different from the first embodiment, will be described below with reference to the flow chart of FIG. 5, centering on the operation of the power supply control means (1b).

This embodiment is common to the first embodiment from the insertion of the cassette to the setting of the stop mode and will not be described.

The feature of this embodiment in the first interrogation cycle after the stop mode is set is that the presence or absence of a tuning operation is added to the interrogation cycle, and the 5-minute timer (1a) is restarted in accordance with the tuning operation. Second point, returning to the first question cycle, second
In addition, when the time-up output of the 5-minute timer (1a) is generated, the tape is unloaded and the power is turned off as in the case of the stop operation, and thirdly, the power is automatically turned off after the completion of the eject during the eject operation. It should be noted that although the tape unloading and power-off are performed in the first inquiry cycle during the reservation operation at the time of the reservation operation, although not shown in FIG. 2, it is common to the first embodiment. is there.

Further, when the mode setting operation is performed in the first interrogation cycle, if the setting operation is fast forward or rewind, the capstan motor is directly driven without operating the mode setting mechanism. When the mode button operation is performed due to the change, the mode setting mechanism causes the reel table (T
Although not shown in FIG. 3, the point that the desired mode is set after the brakes are once applied to M) and (SM) is also common to the first embodiment.

The greatest feature of this embodiment is that there is no mode for stopping the rotation of the cylinder in the stopped state, and there is no second interrogation cycle in the first embodiment.

The feature of this embodiment in the third interrogation cycle after power-off is that the power-on state is activated when the tuning operation is performed, and the 5-minute timer (1a) is started. The point is to turn it off. Although not shown in FIG. 3, the fact that the power-on state is set in response to the reservation operation in the third question cycle and the power-off state is set in response to the reservation completion in the third question cycle is entered. This is common to the first embodiment.

Regarding the timer recording operation of this embodiment, the first operation in FIG.
This is the same as the embodiment.

In both of the above-mentioned two embodiments, the timer reservation information can be set before mounting the cassette.
Although not shown in the flow chart in the figure, the microcomputer (1) for syscon does not show the error of the cassette (CA) after the cassette is installed when the reserved output is generated from the microcomputer (7) for the timer before installing the cassette. When the nail fold detection sensor (S) detects that the erasure prevention nail is not broken, the power is turned off at that point and the third interrogation cycle is entered.

In addition, there is no power switch in the two embodiments described above,
As described above, by pressing the stop button twice, the power is turned on and off.

Further, neither timer mode setting switch exists in both embodiments, and reserved recording is performed in the power off mode.

(G) Effect of the Invention According to the present invention, the cylinder that is rotating while the stop mode is set stops rotating after a predetermined period of time, so that power loss can be prevented and the effect is great.

[Brief description of drawings]

FIG. 1 is a plan view schematically showing the state of each setting mode of the present invention, FIG. 2 is a circuit block diagram of the first embodiment, FIG. 3 is a flow chart of the first embodiment, and FIG. A circuit block diagram of the second embodiment and FIG. 5 show a flow chart of the second embodiment. (1a) ... 5-minute timer, (1b) ... power control means,
(1) ... Microcomputer for syscon, (3) ... Mode detection means, (CY) ... Cylinder, (16) ... Cylinder motor

Claims (2)

[Claims] 1. A cylinder motor is driven in tandem with completion of cassette loading to perform tape loading, and at the tape loading completion position, the cylinder motor is continuously driven without applying tension to the tape to set a stop mode for reproduction. In a video tape recorder that presses a pinch roller to a capstan in conjunction with operation and applies tension to the tape to set the playback mode, the stop mode setting period is counted and the cylinder motor is driven after a predetermined period has elapsed. Standby release circuit characterized by stopping. 2. A cylinder motor is driven in synchronism with the completion of cassette loading to perform tape loading, and the cylinder motor is continuously driven without applying tension to the tape at the tape loading completion position to set a stop mode for reproduction. In a video tape recorder that presses a pinch roller to a capstan in synchronism with operation and applies tension to the tape to set a playback mode, timer means that starts counting in synchronism with stop mode setting; Power supply control means for unloading the tape to turn off the power supply by the time-out output of the means and reset means for resetting the timer means in synchronization with the tuning operation when the tape loading is completed are provided. Standby release circuit consisting of.